My last day in India is a Thursday, and I'll be in Varanasi. I fly home from DEL on Friday at 2am. How much time should I give myself to ensure I make my flgiht home?

There's a 16:30 AI flight from VNS to DEL, arriving at 18:00. That looks like enough of a buffer, but it has a terrible on-time rating....

There's also some later flights. Not sure how cautious to be.